I started drinking at 2 months post op.
I know this is a little early but it is hard because a lot of your social life is going out to eat/grabbing a drink.
I couldn't physically sit down and eat a whole meal but sometimes unwinding with a few friends and drink is good for the soul.
I was very cautious about what I was drinking though- I didn't want to drink the empty calories, carbs and suffer later by not losing weight.
So I invited friends over to my place- I bought Tito's vodka (which is less than half the calories [60] of other regular vodkas] and also bought Diet Cranberry juice- which i believe had 3g carbs and a lot less of everything else and very low calorie.
I drank 2 of these and felt great. No stomach pain/ didn't bother my stomach/ and had a good buzz- wasn't shit faced.
I think you need to follow your body's signals when it comes to certain things and not be so hard on yourself.